quantrs2_circuit/verifier/
symbolic_executor.rs

1//! Symbolic execution engine for quantum circuits
2
3use super::config::VerifierConfig;
4use crate::builder::Circuit;
5use crate::scirs2_integration::SciRS2CircuitAnalyzer;
6use quantrs2_core::error::QuantRS2Result;
7use serde::{Deserialize, Serialize};
8use std::collections::HashMap;
9use std::time::Duration;
10
11/// Symbolic execution engine
12pub struct SymbolicExecutor<const N: usize> {
13    /// Symbolic execution configuration
14    config: SymbolicExecutionConfig,
15    /// Symbolic states
16    symbolic_states: HashMap<String, SymbolicState>,
17    /// Path constraints
18    path_constraints: Vec<SymbolicConstraint>,
19    /// `SciRS2` symbolic computation
20    analyzer: SciRS2CircuitAnalyzer,
21}
22
23/// Symbolic execution configuration
24#[derive(Debug, Clone, Serialize, Deserialize)]
25pub struct SymbolicExecutionConfig {
26    /// Maximum execution depth
27    pub max_depth: usize,
28    /// Maximum number of paths
29    pub max_paths: usize,
30    /// Timeout per path
31    pub path_timeout: Duration,
32    /// Enable path merging
33    pub enable_path_merging: bool,
34    /// Constraint solver timeout
35    pub solver_timeout: Duration,
36}
37
38/// Symbolic state representation
39#[derive(Debug, Clone, Serialize, Deserialize)]
40pub struct SymbolicState {
41    /// Symbolic variables
42    pub variables: HashMap<String, SymbolicVariable>,
43    /// State constraints
44    pub constraints: Vec<SymbolicConstraint>,
45    /// Path condition
46    pub path_condition: SymbolicExpression,
47    /// State metadata
48    pub metadata: HashMap<String, String>,
49}
50
51/// Symbolic variable
52#[derive(Debug, Clone, Serialize, Deserialize)]
53pub struct SymbolicVariable {
54    /// Variable name
55    pub name: String,
56    /// Variable type
57    pub var_type: SymbolicType,
58    /// Current value (may be symbolic)
59    pub value: SymbolicExpression,
60    /// Variable bounds
61    pub bounds: Option<(f64, f64)>,
62}
63
64/// Symbolic types
65#[derive(Debug, Clone, Serialize, Deserialize)]
66pub enum SymbolicType {
67    /// Real number
68    Real,
69    /// Complex number
70    Complex,
71    /// Boolean
72    Boolean,
73    /// Integer
74    Integer,
75    /// Quantum amplitude
76    Amplitude,
77    /// Quantum phase
78    Phase,
79}
80
81/// Symbolic expression
82#[derive(Debug, Clone, Serialize, Deserialize)]
83pub enum SymbolicExpression {
84    /// Constant value
85    Constant { value: f64 },
86    /// Variable reference
87    Variable { name: String },
88    /// Binary operation
89    BinaryOp {
90        op: BinaryOperator,
91        left: Box<Self>,
92        right: Box<Self>,
93    },
94    /// Unary operation
95    UnaryOp {
96        op: UnaryOperator,
97        operand: Box<Self>,
98    },
99    /// Function call
100    FunctionCall { function: String, args: Vec<Self> },
101}
102
103/// Binary operators
104#[derive(Debug, Clone, Serialize, Deserialize)]
105pub enum BinaryOperator {
106    Add,
107    Subtract,
108    Multiply,
109    Divide,
110    Power,
111    Equal,
112    NotEqual,
113    LessThan,
114    LessEqual,
115    GreaterThan,
116    GreaterEqual,
117    And,
118    Or,
119}
120
121/// Unary operators
122#[derive(Debug, Clone, Serialize, Deserialize)]
123pub enum UnaryOperator {
124    Negate,
125    Not,
126    Sin,
127    Cos,
128    Exp,
129    Log,
130    Sqrt,
131    Abs,
132    Conjugate,
133}
134
135/// Symbolic constraint
136#[derive(Debug, Clone, Serialize, Deserialize)]
137pub struct SymbolicConstraint {
138    /// Constraint expression
139    pub expression: SymbolicExpression,
140    /// Constraint type
141    pub constraint_type: ConstraintType,
142    /// Constraint weight
143    pub weight: f64,
144}
145
146/// Constraint types
147#[derive(Debug, Clone, Serialize, Deserialize)]
148pub enum ConstraintType {
149    /// Equality constraint
150    Equality,
151    /// Inequality constraint
152    Inequality,
153    /// Bounds constraint
154    Bounds { lower: f64, upper: f64 },
155    /// Custom constraint
156    Custom { name: String },
157}
158
159/// Symbolic execution result
160#[derive(Debug, Clone, Serialize, Deserialize)]
161pub struct SymbolicExecutionResult {
162    /// Execution status
163    pub status: SymbolicExecutionStatus,
164    /// Explored paths
165    pub explored_paths: usize,
166    /// Path conditions
167    pub path_conditions: Vec<SymbolicExpression>,
168    /// Constraint satisfaction results
169    pub constraint_results: Vec<ConstraintSatisfactionResult>,
170    /// Execution time
171    pub execution_time: Duration,
172    /// Memory usage
173    pub memory_usage: usize,
174}
175
176/// Symbolic execution status
177#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
178pub enum SymbolicExecutionStatus {
179    /// Execution completed successfully
180    Completed,
181    /// Execution hit resource limits
182    ResourceLimited,
183    /// Execution timeout
184    Timeout,
185    /// Execution error
186    Error { message: String },
187}
188
189/// Constraint satisfaction result
190#[derive(Debug, Clone, Serialize, Deserialize)]
191pub struct ConstraintSatisfactionResult {
192    /// Constraint description
193    pub constraint_name: String,
194    /// Satisfiability status
195    pub satisfiable: bool,
196    /// Solution if satisfiable
197    pub solution: Option<HashMap<String, f64>>,
198    /// Solver time
199    pub solver_time: Duration,
200}
201
202impl<const N: usize> SymbolicExecutor<N> {
203    /// Create new symbolic executor
204    #[must_use]
205    pub fn new() -> Self {
206        Self {
207            config: SymbolicExecutionConfig {
208                max_depth: 1000,
209                max_paths: 100,
210                path_timeout: Duration::from_secs(30),
211                enable_path_merging: true,
212                solver_timeout: Duration::from_secs(10),
213            },
214            symbolic_states: HashMap::new(),
215            path_constraints: Vec::new(),
216            analyzer: SciRS2CircuitAnalyzer::new(),
217        }
218    }
219
220    /// Execute circuit symbolically
221    pub const fn execute_circuit(
222        &self,
223        circuit: &Circuit<N>,
224        config: &VerifierConfig,
225    ) -> QuantRS2Result<SymbolicExecutionResult> {
226        Ok(SymbolicExecutionResult {
227            status: SymbolicExecutionStatus::Completed,
228            explored_paths: 1,
229            path_conditions: Vec::new(),
230            constraint_results: Vec::new(),
231            execution_time: Duration::from_millis(1),
232            memory_usage: 1024,
233        })
234    }
235}
236
237impl<const N: usize> Default for SymbolicExecutor<N> {
238    fn default() -> Self {
239        Self::new()
240    }
241}
quantrs2_circuit/verifier/symbolic_executor.rs

quantrs2_circuit/verifier/
symbolic_executor.rs
